CN101265679B - Transfer paper for electrophotography - Google Patents

Transfer paper for electrophotography Download PDF

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Publication number
CN101265679B
CN101265679B CN200710199834XA CN200710199834A CN101265679B CN 101265679 B CN101265679 B CN 101265679B CN 200710199834X A CN200710199834X A CN 200710199834XA CN 200710199834 A CN200710199834 A CN 200710199834A CN 101265679 B CN101265679 B CN 101265679B
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paper
electrophotography
base material
quality
moisture absorption
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CN101265679A (en
Inventor
栗原英三
松田司
布施真理雄
山口昭治
高桥邦广
时吉智文
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/0046—Organic components thereof being macromolecular obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0053—Intermediate layers for image-receiving members

Abstract

A transfer paper for electrophotography contains a pulp fiber and a magnetic material for generating a large Barkhausen effect. An average dehydration speed S 1 a (an average value (% by mass/second) of dehydration speeds S 1 of 5 sheets of paper) is 0.15 or less. The dehydration speed S 1 is represented by (W 1 a-W 1 b)/30. Here, W 1 a represents a moisture content ratio (% by mass) of the paper after moisture conditioning, and W 1 b represents a moisture content ratio (% by mass) of the paper after a dehydration process including leaving the paper in a 80 DEG C. environment for 30 seconds after moisture conditioning.

Description

Transfer paper for electrophotography
Technical field
The present invention relates to transfer paper for electrophotography, described transfer paper for electrophotography is used for the printing operation that undertaken by recording materials (as toner and ink) commonly used, and comprises the magnetic material that is used to send the signal that can detected device detects.
Background technology
Such as false proof in the special files such as bank note and marketable securities is very important.For preventing that such special file is forged, known so far have in special file, put into or the technology (the flat 7-32778 communique of Japanese kokai publication hei 10-143708 communique and Te Kai) of the metal fibre of making by magnetic material etc. that embedding can detect by the magnetic signal detector.
On the other hand, the universal of computer, compounding machine and computer network makes it possible to be easy to obtain required information from bulk information, and with the information printing or the duplicating of obtaining.Therefore, will be by illegal duplicating or printing machine confidential information and the printed matter that obtains is taken away the generation that has caused serious confidential information leakage problem.Thereby the confidential information that causes for the printed matter that prevents this illegal duplicating or be printed with confidential information is pulled away is leaked, and has proposed to strengthen the various apparatus and method of Information Security.
For example, proposed following method and strengthened the security of information: promptly be used in combination the printing paper that comprises the magnetic material that can write down intrinsic identifying information and judge the information read device of the legitimacy of the intrinsic information that on printing paper, prints (TOHKEMY 2004-284053 communique and Te Kai 2004-285524 communique) by reading intrinsic identifying information.
Summary of the invention
At above-mentioned false proof special file and the printing paper of being used for, will put into or be embedded in paper such as magnetic materials such as metal fibres., have in the situation of big barkhausen herein, can utilize this effect detection to derive from the pulse signal of magnetic material by checkout gear, thereby confirm the existence of paper at described magnetic material.Yet when forming image on the paper that is comprising the magnetic material with big barkhausen by xerography, image has just formed the afterpulse signal and can temporarily weaken, the result, and the precision that detects of the existence of paper reduces.
The objective of the invention is to address the above problem.That is, the purpose of this invention is to provide a kind of transfer paper for electrophotography, even after just forming image, also can suppress the decline that detects precision of paper by xerography.
Above-mentioned purpose can be achieved by recording medium of the present invention is provided.That is, the invention provides following scheme.
First scheme of transfer paper for electrophotography of the present invention, this transfer paper for electrophotography comprises paper pulp fiber at least and is used to produce the magnetic material of big barkhausen, wherein, the average dehumidification speed S1a as giving a definition of this transfer paper for electrophotography is below 0.15:
[described average dehumidification speed S1a (quality %/second) is meant the mean value of the dehumidification speed S1 of 5 paper, and dehumidification speed S1 described herein is meant the value by following formula (1) representative]:
Formula (1) dehumidification speed S1=(W1a-W1b)/30:
[in formula (1), W1a representative in the environment of 23 ℃/50%RH (relative humidity) with the moisture content (quality %) of paper damping described paper in back more than 12 hours, W1b representative will be in the environment of 23 ℃/50%RH the described paper of damping after more than 12 hours in 80 ℃ environment, places 30 seconds carrying out the moisture content (quality %) of the described paper after dehumidification is handled, the constant in the formula shown in the denominator represent described dehumidification handle need time (30 seconds)].
The alternative plan of transfer paper for electrophotography of the present invention, this transfer paper for electrophotography comprises paper pulp fiber at least and is used to produce the magnetic material of big barkhausen, wherein, the average rate of moisture absorption S2a as giving a definition of this transfer paper for electrophotography is more than 0.045:
[described average rate of moisture absorption S2a (quality %/second) is meant the mean value of the rate of moisture absorption S2 of 5 paper, and rate of moisture absorption S2 described herein is meant the value by following formula (2) representative]:
Formula (2) rate of moisture absorption S2=(W2b-W2a)/30:
[in formula (2), W2a representative in the environment of 10 ℃/15%RH with the moisture content (quality %) of paper damping described paper in back more than 12 hours, W2b representative will be in the environment of 10 ℃/15%RH the described paper of damping after more than 12 hours in the environment of 28 ℃/85%RH, places 30 seconds carrying out the moisture content (quality %) of the described paper after moisture absorption is handled, the constant in the formula shown in the denominator represent described moisture absorption handle need time (30 seconds)].
Third party's case of transfer paper for electrophotography of the present invention be as first or alternative plan in the described transfer paper for electrophotography of arbitrary scheme, wherein, the suction dehumidification speed by following formula (3) definition of described transfer paper for electrophotography is more than 0.3 than R:
Formula (3) is inhaled dehumidification speed than the average dehumidification speed of the average rate of moisture absorption S2a/ of R=| S1a|:
[in formula (3), described average dehumidification speed S1a (quality %/second) is meant the mean value of the dehumidification speed S1 of 5 paper, dehumidification speed S1 described herein is meant the value by following formula (1) representative, described average rate of moisture absorption S2a (quality %/second) is meant the mean value of the rate of moisture absorption S2 of 5 paper, and rate of moisture absorption S2 described herein is meant the value by following formula (2) representative].
The cubic case of transfer paper for electrophotography of the present invention is as first to the described transfer paper for electrophotography of third party's case, and wherein, described magnetic material is that length is that 10mm～430mm and diameter are the silk thread shape magnetic material of 10 μ m～90 μ m.
The 5th scheme of transfer paper for electrophotography of the present invention is as first or the described transfer paper for electrophotography of third party's case, wherein, has applied the processing that the moisture on the thickness direction that is used to suppress paper moves.
The 6th scheme of transfer paper for electrophotography of the present invention is as first or the described transfer paper for electrophotography of third party's case, described transfer paper for electrophotography comprises the layer that comprises described paper pulp fiber and described magnetic material at least, with the barrier layer of containing barrier material, wherein, dispose described barrier layer on the described two sides that comprises the layer of paper pulp fiber and magnetic material at least.
The 7th scheme of transfer paper for electrophotography of the present invention is as first the described transfer paper for electrophotography of arbitrary scheme to third party's case, wherein, the moisture content of the described paper of damping after more than 12 hours is 4.0 quality %～7.0 quality % in the environment of 23 ℃/50%RH.
Transfer paper for electrophotography of the present invention the from all directions case be as first or the described transfer paper for electrophotography of third party's case, wherein, applied the processing that is used to improve moisture retention.
The 9th scheme of transfer paper for electrophotography of the present invention is as first or the described transfer paper for electrophotography of third party's case, described transfer paper for electrophotography comprises humectant, wherein, with respect to the described paper pulp fiber of 100 parts by mass, the content of described humectant is greater than 0 parts by mass and is less than or equal to 50 parts by mass.
The tenth scheme of transfer paper for electrophotography of the present invention is as first the described transfer paper for electrophotography of arbitrary scheme to third party's case, described transfer paper for electrophotography comprises the paper base material that contains described paper pulp fiber and described magnetic material, wherein, described paper base material comprises three layers paper base material layer.
The 11 scheme of transfer paper for electrophotography of the present invention is as the described transfer paper for electrophotography of the tenth scheme, and wherein, the paper base material layer of central authorities that is arranged in the thickness direction of paper comprises described magnetic material.
The 12 scheme of transfer paper for electrophotography of the present invention is as the described transfer paper for electrophotography of the tenth scheme, wherein, the Stockigt degree of sizing of the paper base material layer of the central authorities of the described thickness direction that is arranged in paper is more than 40 seconds, is below 35 seconds at the Stockigt degree of sizing of the paper base material layer of the two sides configuration of the paper base material layer of the central authorities of the described thickness direction that is arranged in paper.
According to first scheme of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to the alternative plan of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to third party's case of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that also can more effectively suppress the decline that detects precision of paper after just forming image by xerography can be provided.
According to the cubic case of transfer paper for electrophotography of the present invention, can provide a kind of and can fully produce big barkhausen, and suppress the lip-deep transfer paper for electrophotography that paper was given prominence to or be exposed to magnetic material effectively.
According to the 5th scheme of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to the 6th scheme of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to the 7th scheme of transfer paper for electrophotography of the present invention, can provide a kind of transfer paper for electrophotography that by the xerography imaging time, can obtain excellent image.
According to all directions case of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to the 9th scheme of transfer paper for electrophotography of the present invention, even a kind of transfer paper for electrophotography that detects precise decreasing that also can suppress paper after just forming image by xerography can be provided.
According to the tenth scheme of transfer paper for electrophotography of the present invention, can provide a kind of transfer paper for electrophotography that comprises paper base material with three layers of formation.
According to the 11 scheme of transfer paper for electrophotography of the present invention, a kind of transfer paper for electrophotography can be provided, the compare paper surface more inner position of described transfer paper for electrophotography in this paper comprises magnetic material.
According to the 12 scheme of transfer paper for electrophotography of the present invention, can provide a kind of transfer paper for electrophotography that can reduce average dehumidification speed S1a and suppress the bad generation of toner transfer printing.
Description of drawings
To be described in detail illustrative embodiments of the present invention based on following accompanying drawing, wherein:
Fig. 1 is the figure that is shown as an example of the Strength Changes that looks like front and back detected pulse signal from paper;
Fig. 2 A～2C is a key diagram of describing big barkhausen, wherein:
Fig. 2 A is the figure that shows the B-H characteristic;
Fig. 2 B is the figure that is presented at by the electric current that produces in the magnetic test coil in the situation of magnet exciting coil generation alternating magnetic field; Wherein the longitudinal axis of last figure is represented coercivity, and the longitudinal axis of figure below is represented electric current, and the transverse axis in last figure and figure below is represented the time;
Fig. 2 C is the figure that shows by the detected electric current of magnetic test coil; Its longitudinal axis is represented electric current, and its transverse axis is represented the time;
Fig. 3 A～3C is the schematic diagram of formation that shows the detecting gate of the evaluation be used for embodiment;
Fig. 3 A is the front view of described detecting gate;
Fig. 3 B is the side view (the arrow directions X from Fig. 3 A is observed) that constitutes the checkout gear of described detecting gate;
Fig. 3 C is the vertical view (the arrow Y direction from Fig. 3 A is observed) that constitutes the checkout gear of described detecting gate.
The specific embodiment
＜just formed the temporary transient decline of the pulse signal output behind the image 〉
Even in order also to confirm the existence of paper after just by the xerography imaging, the present inventor has studied following phenomenon in earnest: when forming image on the paper that is comprising the magnetic material with big barkhausen by xerography, be difficult to detect for the moment pulse signal after just forming image.
The inventor has at first investigated the Strength Changes of imaging front and back detected pulse signals from paper.Found that the intensity generation variation as shown in fig. 1 of pulse signal.
Fig. 1 is the figure that is shown as an example of the Strength Changes that looks like front and back detected pulse signal from paper.Among Fig. 1, transverse axis is represented the time; The longitudinal axis is represented the intensity of the pulse signal that detects; The interval that symbol A represents is meant the state before the photographic fixing; The interval that symbol B represents is meant the state (paper is heated state in by the photographic fixing machine, and tens of approximately milliseconds consuming time are to hundreds of milliseconds) in the fixing; The state of (after forming image) after the interval that symbol C represents is meant photographic fixing.In addition, the interval represented of symbol ND is meant the state (or pulse signal intensity be in or be lower than the state that predeterminated level so that detected device are identified as " paper does not exist ") that is difficult to be detected by checkout gear pulse signal.
In addition, solid line is represented the pulse signal time-dependent variation in intensity (the interval interior solid line that symbol B shows is represented predicted value) of the specified point that the surveyed area of checkout gear is interior, the chain-dotted line that is replaced by the length shown in the symbol L is represented minimum strength (the perhaps intensity of the following stated: when being in this intensity of the pulse signal that detects of a specified point in the surveyed area of checkout gear, judge that by the pulse signal intensity that detects paper exists or do not exist, after judgement has detected paper, send) such as detecting signals such as alarm tones.Although the existence of interval ND whether and length depend on the formation of checkout gear, they become with the position in the surveyed area of checkout gear usually.
From Fig. 1, it is evident that, a specified point in the surveyed area of checkout gear, pulse signal intensity sharply is reduced in fixing below the detection limit intensity (or detecting judgement intensity).Then, after photographic fixing, increase gradually (recovery), and rise to detection limit intensity (or detecting judgement intensity) once more more than the level in (through behind the interval ND) after the short time.Therefore, after the photographic fixing between a moment, when hope confirms to be formed with the existing of paper of image by checkout gear, in surveyed area, produce the zone that can not detect paper.
For example, by setting detection limit intensity (or detect judge intensity) even so that can show that minimizing time point detects paper just forming image afterpulse signal strength signal intensity, can suppress just the decline that detects precision (increase of the not detectable region in the reduction of detection probability and/or the surveyed area) by xerography paper after the imaging on comprising the paper of magnetic material.Yet in fact because noise detecting signal is also increasing, this can cause the operate miss of checkout gear to increase.In addition, the specification that needs to improve checkout gear is so that can detect weak pulse towards signal, and this also is unpractical.Also can consider the method in a large amount of magnetic materials adding paper; But, the surface of paper can occur by magnetic material cause concavo-convex, therefore when imaging, be easy to take place by these concavo-convex transfer printing defectives that causes.
Thereby in the time of from the viewpoint, the effective method that is used to improve detection is: method and (2) that (1) pulse signal intensity decreases during to photographic fixing suppresses increase the method that (recovery) promotes to the pulse signal intensity after the photographic fixing.
During photographic fixing, the paper that comprises magnetic material is in heating such as fixing members such as fixing rollers of heated condition.Thereby rapid evaporation causes the paper dehumidification by heating owing to the large quantity of moisture that contains in the paper, so shrinks stress in the paper.After the photographic fixing, the moisture that paper absorbs in the atmosphere gradually reaches poised state until the moisture of paper, and the shrinkage stress of the paper that produces during photographic fixing relaxes gradually.
It is consistent with the process of the pulse signal Strength Changes that shows among Fig. 1 to follow the rapid generation of the shrinkage stress that the dehumidification-moisture absorption of paper before and after the photographic fixing changes and slow mitigation process subsequently to tend to.Therefore, thus the shrinkage stress that the inventor proposes to produce in the paper influences the variation that magnetic material produces the pulse signal intensity that shows among Fig. 1.That is, can infer, along with producing a large amount of shrinkage stresses in the paper fast, the stress that is applied to magnetic material equally causes reducing sharply of pulse signal intensity.Then, if the shrinkage stress that has produced relaxes gradually, the stress that is applied to magnetic material also can relax gradually.Can infer pulse signal intensity can recover thus gradually.
Thereby the inventor proposes the decline of (1) the pulse signal intensity when being suppressed at photographic fixing, and the dehumidification of the paper that the heating when suppressing by photographic fixing causes is important, realizes following first scheme of the present invention thus.In addition, the inventor proposes (2) for the increase (recovery) that promotes the pulse signal intensity after photographic fixing, and it is important making the moisture in the paper fast Absorption atmosphere after the photographic fixing, realizes the alternative plan of describing later of the present invention thus.
＜transfer paper for electrophotography 〉
-the first scheme-
The transfer paper for electrophotography of first scheme of the present invention (can be described as " transfer paper " or " paper " below " transfer paper for electrophotography ") comprise at least paper pulp fiber and be used to produce big barkhausen magnetic material (below, described magnetic material can abbreviate " magnetic material " as), wherein, average dehumidification speed S1a is about below 0.15.
Described average dehumidification speed S1a (quality %/second) is meant the mean value of the dehumidification speed S1 of 5 paper, and dehumidification speed S1 described herein is meant the value by following formula (1) representative:
Formula (1) dehumidification speed S1=(W1a-W1b)/30:
[in formula (1), W1a representative in the environment of 23 ℃/50%RH with the moisture content (quality %) of described paper after the paper damping is more than 12 hours, W1b representative will be in the environment of 23 ℃/50%RH the described paper of damping after more than 12 hours in 80 ℃ environment, places 30 seconds carrying out the moisture content (quality %) of the described paper after dehumidification is handled, the constant in the formula shown in the denominator represent described dehumidification handle need time (30 seconds)].
W1a shown in the formula (1) be meant " 100 * (with paper in the environment of 23 ℃/50%RH damping more than 12 hours after the absolute dry mass of quality-described paper of described paper)/the absolute dry mass of described paper ", W1b is meant " the absolute dry mass of 100 * (the absolute dry mass of the quality-described paper of the paper after dehumidification is handled)/described paper ".
Herein, stove (trade name: DVS 401, by Yamato science Co., Ltd. make) is used for the dehumidification of paper to be handled, when dehumidification is handled with the air heat to 80 of 23 ℃/50%RH ℃.
In addition, the following acquisition of the dry mass of described paper: in 105 ℃ stoves (trade name: DVS 401 is made by Yamato science Co., Ltd.) the paper heating more than 5 hours, is placed paper drier heat release 30 minutes then, the quality that paper is measured in the back is handled in heat release.
The quality of the paper of handling under each condition uses balance (trade name: AB204S is made by METTLER-TOLEDO K.K.) to measure, and the paper that is used for a series of mensuration and evaluation is of a size of the A4 size.
Described average dehumidification speed S1a is about 0.15 quality %/below second, is preferably about 0.14 quality %/below second.
As described average dehumidification speed S1a during greater than about 0.15 quality %/second, when the shrinkage stress that produces in the paper can be owing to photographic fixing in the paper the rapid evaporation of moisture increase, thereby cause the remarkable decline of pulse signal intensity.In this case, can not suppress the decline that detects precision of paper after the imaging just.
On the other hand,,, be preferably about 0.08 quality %/more than second in the practicality, more preferably from about 0.10 quality %/more than second for avoiding the manufacturing difficulty etc. of Hard copy body although the lower limit of described average dehumidification speed S1a is not particularly limited.
Herein, the dehumidification characteristic when described average dehumidification speed S1a represents that paper is heated specifically, is to obtain with the form by the mean value of the dehumidification speed S1 that calculates shown in the formula (1).
In formula (1), W1a represents to be in the moisture content of the paper of state before the photographic fixing (in the example shown in Figure 1, the state that is shown by interval A), (23 ℃/50%RH) be assumed to the general environment of configuration imaging device of the damping conditions when measuring W1a.
In addition, W1b represents just to finish the simulation reconstruction value of the moisture content of the paper under the state (in the example shown in Figure 1, the state of the boundary position between interval B and the interval C) after the photographic fixing.
The dehumidification condition (80 ℃, 30 seconds dehumidification is handled) that is used to obtain W1b is the condition that temperature is lower and the time is longer than common fixing conditions.This be because, for example consider when paper is transferred to the time that determinator spends by fixing device, extremely difficult the moisture content of just implementing in the paper after common photographic fixing is handled is carried out the good mensuration of repeatability.Thereby the suitable dehumidification condition of the simulation reconstruction value of the dehumidification state when inventor's reasonable assumption can provide photographic fixing is 80 ℃, 30 seconds.
That is, the reason that the dehumidification temperature is set at 80 ℃ is, during owing to photographic fixing paper inner with the paper surface between the temperature difference that produces cause the bulk temperature of paper to be lower than fixing temperature, the bulk temperature of supposition paper is about 80 ℃.
In addition, be that 30 seconds reason is as follows with the dehumidification time set.At first, the heating operation during photographic fixing is by will be also contacting the direct heating of carrying out (solid Contact Heating) with paper as the fixing member of thermal source.Thereby the operation that the heat energy of scheduled volume is applied to paper only requires a very short time.Dehumidification condition when on the other hand, obtaining W1b is included in the indirect in the stove.Thereby, in order to apply as far as possible near the heat energy that is applied to the total heat energy of paper when the photographic fixing, time that need be longer than fixing time.When considering the repeatability of guaranteeing measured value, preferably long heat time heating time.Yet,, have deviation between the dehumidification characteristic of the dehumidification characteristic of the paper in the time of might causing carrying out dehumidification and handle and the paper when carrying out photographic fixing if heat time heating time is long.Given this, the inventor except above mentioned reason for to guarantee that the repeatability of measured value is 30 seconds with the damping time set.
Being used to control average dehumidification speed S1a the example that is about method below 0.15 generally includes but specifically is not limited to: improve paper moisture retention method and suppress the method that the moisture of paper thickness direction moves and spreads.
The example of preceding a kind of method comprises humectant is added in the paper.The example of a kind of method in back comprises the method that the barrier layer is set, and this barrier layer has the function that suppresses the moisture diffusion on the paper thickness direction, even it is used under the heat treated when photographic fixing also the moisture retention of paper is maintained high as far as possible level; And the method that increases the Stockigt degree of sizing of paper (being at least the layer that contains magnetic material).These methods will be described in detail in the back.
-alternative plan-
The transfer paper for electrophotography of alternative plan of the present invention comprises paper pulp fiber at least and is used to produce the magnetic material of big barkhausen, and the average rate of moisture absorption S2a that this transfer paper for electrophotography has is about more than 0.045.
Described average rate of moisture absorption S2a (quality %/second) is meant the mean value of the rate of moisture absorption S2 of 5 paper, and rate of moisture absorption S2 described herein is meant the value by following formula (2) representative:
Formula (2) rate of moisture absorption S2=(W2b-W2a)/30:
[in formula (2), W2a representative in the environment of 10 ℃/15%RH with the moisture content (quality %) of described paper after the paper damping is more than 12 hours, W2b representative will be in the environment of 10 ℃/15%RH the described paper of damping after more than 12 hours in the environment of 28 ℃/85%RH, places 30 seconds carrying out the moisture content (quality %) of the described paper after moisture absorption is handled, the constant in the formula shown in the denominator represent described moisture absorption handle need time (30 seconds)].
W2a shown in the formula (2) is meant " the absolute dry mass of 100 * the absolute dry mass of quality-described paper of paper damping described paper in back more than 12 hours (in the environment of 10 ℃/15%RH with)/described paper ", and W2b represents " the absolute dry mass of 100 * (the absolute dry mass of the quality-described paper of the paper after moisture absorption is handled)/described paper ".
Be used to measure the size of the assay method of quality of processing method, this paper of the paper of absolute dry mass and the paper that is used for a series of mensuration and evaluation identical with shown in the formula (1).
Described average rate of moisture absorption S2a is about 0.045 quality %/more than second, is preferably about 0.05 quality %/more than second.
If described average rate of moisture absorption S2a is less than about 0.045 quality %/second, then the moisture in the atmosphere can not be absorbed by the paper after the photographic fixing, and the shrinkage stress that produces in the paper when being difficult to relax photographic fixing causes the remarkable delay of the increase (recovery) of pulse signal intensity.As a result, can not suppress the decline that detects precision of the paper after the imaging just.
On the other hand,,, be preferably about 0.10 quality %/below second in the practicality, more preferably from about 0.09 quality %/below second for the manufacturing difficulty of avoiding the Hard copy body etc. although the higher limit of average rate of moisture absorption S2a is not particularly limited.
Herein, average rate of moisture absorption S2a represents to be in the moisture-absorption characteristics of paper of the state (after photographic fixing just) of low-water-content, specifically, is to obtain with the form by the mean value of the rate of moisture absorption S2 that calculates shown in the formula (2).
For exact evaluation paper intrinsic moisture-absorption characteristics, it is believed that more effective is to estimate moisture-absorption characteristics by accelerated test, rather than estimates moisture-absorption characteristics by the fuchsin(e)test of carrying out based on the temperature and humidity conditions after the photographic fixing.
Its reason is that the moisture content of the paper of (by the STA representation of the boundary position between interval B among Fig. 1 and the interval C) after the photographic fixing just depends on the kind of used paper and fixing conditions and is irregular to a certain extent.That is the moisture content that, is difficult to the paper before fixedly moisture absorption is handled.
If the atmospheric humidity that paper moves after photographic fixing around (taken away by the people etc.) so that the described paper changes (for example, checkout gear is configured near the porch the door etc.), then the moisture content of paper is irregular to a certain extent.That is, be difficult to be fixed on the moisture content of the paper after moisture absorption is handled.
Given this, the inventor the temperature and humidity condition when measuring the W2b will be used to calculate rate of moisture absorption S2 and W2a has been carried out selection so that the moisture content of the paper of moisture absorption before handling is as much as possible little, and the moisture content of the paper after moisture absorption is handled is big as much as possible.
If the moisture absorption processing time shown in the formula (2) is too short, the repeatability of measured value (W2b) reduces.On the other hand, if the moisture absorption processing time is long, then moisture absorption is handled to be not only under the state that the moisture content at paper increases and is carried out, and the possibility of carrying out under high saturation state becomes big, causes the deviation of the relative actual value of rate of moisture absorption S2 of calculating to become big thus.Thereby, being these effects of balance, the moisture absorption processing time is set at 30 seconds.
Being used for controlling average rate of moisture absorption S2a the example that is about method more than 0.045 comprises but is not limited to especially: will not add the method in the paper as the filler of the composition that suppresses the paper pulp fiber moisture absorption that paper comprises and contain the method that suppresses filer content under the situation of filler at described paper bag.
Other examples also comprise method that the density that reduces paper is moved to the inside of paper by the outside of paper with the hydrone that promotes in the atmosphere and the method for adding humectant in paper.These methods will be discussed in more detail below.
-average dehumidification speed S1a and average rate of moisture absorption S2a-
As above explanation, paper of the present invention can meet the following conditions:＜1〉average dehumidification speed S1a is about below 0.15, or＜2〉average rate of moisture absorption S2a be about more than 0.045.In order more effectively to suppress the decline that detects precision of the paper after the imaging just, preferably satisfy above-mentioned condition＜1 simultaneously〉and＜2.
Preferably satisfy above-mentioned condition＜1 in addition〉and＜2 at least one, and also satisfy other conditions: the suction dehumidification speed by following formula (3) definition is about more than 0.3 than R:
Formula (3) is inhaled dehumidification speed than the average dehumidification speed of the average rate of moisture absorption S2a/ of R=| S1a|:
[in formula (3), described average dehumidification speed S1a (quality %/second) is meant the mean value of the dehumidification speed S1 of 5 paper, dehumidification speed S1 described herein is meant the value by following formula (1) representative, described average rate of moisture absorption S2a (quality %/second) is meant the mean value of the rate of moisture absorption S2 of 5 paper, and rate of moisture absorption S2 described herein is meant the value by following formula (2) representative].
Described suction dehumidification speed is preferably about more than 0.3 than R, more preferably from about more than 0.32, and then more preferably from about more than 0.35.Inhale dehumidification speed than R less than about 0.3 situation in, be difficult to effectively to suppress the decline that detects precision of the paper after the imaging just.
Be not particularly limited than the higher limit of R although inhale dehumidification speed, be preferably in the practicality about below 1.0, more preferably from about below 0.7.
Below, will constituent material, manufacture method and the various physical propertys etc. of paper of the present invention be described in detail.
-magnetic material-
Material with big barkhausen can be used as the magnetic material that comprises in the paper of the present invention.To carry out simple declaration to big barkhausen herein.Fig. 2 is the key diagram of big barkhausen.Big barkhausen is meant when the B-H characteristic that has as shown in Fig. 2 A, promptly, has the rapid magnetization inversion phenomenon that the material (for example, the amorphous magnetic material that is made of Co-Fe-Ni-B-Si) of rectangular substantially hysteresis curve and relatively low coercivity (Hc) is occurred when being placed in the alternating magnetic field.Therefore, if pass through to supply with alternating current with the generation alternating magnetic field to magnet exciting coil, and magnetic material is placed in this alternating magnetic field, the pulse type electric current will flow through and be arranged near the magnetic test coil of magnetic material during magnetization inversion.
For example, if utilize magnet exciting coil to produce the alternating magnetic field shown in the first half of Fig. 2 B, the magnetic test coil of will flowing through of the pulse current shown in the latter half of Fig. 2 B then.The pulse current of magnetization inversion is followed in the peak representative that symbol P among Fig. 2 B represents.
Yet the electric current of the magnetic test coil of flowing through also comprises the alternating current that is produced by the alternating magnetic field induction.Therefore, it can be detected when pulse current is superimposed upon on this alternating current.In addition, be placed in the alternating magnetic field if will comprise the material of multiple magnetic material, a plurality of pulse currents superpose, thereby detect the electric current as shown in Fig. 2 C.
The example that is included in the magnetic material in the paper of the present invention generally include the rare-earth-type material that contains permanent magnet (as neodymium (Nd)-iron (Fe)-boron (B)), mainly comprise the magnetic material of samarium (Sm)-cobalt (Co), mainly comprise aluminium nickel cobalt (alnico) the class magnetic material of aluminium (Al)-nickel (Ni)-cobalt (Co), mainly comprise ferrite class magnetic material, soft magnetic material and the oxide soft magnetic material of barium (Ba) or strontium (Sr) and iron oxide (Fe2O3), the preferred amorphous magnetic material that basic composition is Fe-Co-Si or Co-Fe-Ni that uses.
The shape of described magnetic material is not particularly limited, and gets final product so long as be suitable for producing the thin-and-long of big barkhausen; Yet for producing big barkhausen, the specific length that has with respect to cross-sectional area is necessary.Given this, it is preferred being fibrous (as silk thread shape or band shape) substantially, more preferably is the silk thread shape.
If magnetic material is a silk thread shape magnetic line, as mentioned above, for producing big barkhausen, its diameter is preferably more than about 10 μ m.Maximum gauge is preferably below about 90 μ m, more preferably from about below the 80 μ m.If diameter is greater than about 90 μ m, even then the magnetic material inside that is included in paper also may be given prominence on the surface of paper.
For producing big barkhausen, more than the preferably about 10mm of the length of magnetic line.The maximum length of described magnetic line can be any length, as long as the magnetic line when comprising in paper inside can not appear so that be exposed to paper from paper.Although be not particularly limited, described length is preferably below about 430mm.
The diameter and the length of the whole magnetic lines that preferably comprise in the paper satisfy above-mentioned scope.Yet if the value of the diameter of magnetic line and length has certain distribution, mean value preferably satisfies above-mentioned scope.
-be used for the method and apparatus of test paper-
Because paper bag of the present invention contains above-mentioned magnetic material, therefore, when being placed on paper in the magnetic field, the existence of paper can detect the signal of telecommunication (pulse signal as shown in Figure 2) that is produced by magnetic material by checkout gear and obtain confirming.
The formation and the occupation mode of checkout gear are not particularly limited, as long as above-said current signal can be detected with a certain form.Yet, in the present invention, preferably use following checkout gear, it has a pair of non-contact type detecting unit, thereby described a pair of detecting unit be fixed in that the precalculated position has can be for the people from the width that passes through between the two (below can be described as " detecting gate ").
In detecting gate, between described a pair of detecting unit, form surveyed area.If this makes paper of the present invention by detecting gate then the existence of paper can be perceived.Come this detection mode of the existence of test paper to can be used for for example preventing on paper, forming the illegal duplicating or the illegal steal of the confidential information of image by detecting gate.Yet the purposes of paper of the present invention is not limited to above-mentioned application.
-paper base material-
Below paper base material will be described.Paper bag of the present invention is drawn together the paper base material that contains paper pulp fiber and magnetic material.Paper base material can have two-layer or two-layer above layer, can be provided with on the one side at least of described paper base material such as the pigment coated superficial layer that waits in case of necessity.
Comprise as the preference of the paper pulp fiber of the main component of paper base material but specifically be not limited to following paper pulp fiber: broad leaf tree and/or acerose kraft pulp fiber, sulfite pulp fiber, semichemical wood pulp fiber, chemistry mill paper pulp fiber, groundwood fiber, correct grinding paper pulp fiber and thermomechanical pulp fiber.Can use as required by cellulose or the hemicellulose that comprises in these fibers carried out the fiber that chemical modification is made.
In addition, can use a kind of in the following various fiber, or use the combination of two or more composition in the following various fiber: the cotton pulp fiber, ramie pulp fiber, the kneaf pulp fiber, the bagasse pulp fiber, viscose rayon fibre, regenerated celulose fibre, the cuprammonium rayon fiber, estron, polyvinyl chloride fiber, polyacrylonitrile fiber, the polyvinyl alcohol fibrid, the polyvinylidene chloride fibrid, the TPO fiber, the polyurethanes fiber, the fluorocarbon fibrid, glass fibre, carbon fiber, alumina fibre, metal fibre and silicon carbide fibre etc.
As required, can use the fiber that obtains such as synthetic resin such as polyethylene, polypropylene, polystyrene, polyvinyl chloride and polyester dippings by above-mentioned paper pulp fiber is used, or use by the fiber that obtains to the above-mentioned paper pulp fiber such as synthetic resin hot melts such as polyethylene, polypropylene, polystyrene, polyvinyl chloride and polyester.Do like this and can improve Taber abrasion loss and internal bond strength.
In addition, can also will go up matter or middle matter secondary stock is sneaked into above-mentioned paper pulp fiber.The combined amount of secondary stock can be determined according to purposes or purpose etc.For example, during mixed waste pulp,, preferably mix the secondary stock of the above amount of about 10 quality %, more preferably mix the secondary stock of the above amount of about 30 quality % with respect to the whole paper pulp fibers that contained in the paper base material when considering from the angle of protection of resources.
The kind that is used for the filler of paper base material is not particularly limited, and the example comprises such as calcium carbonate class fillers such as powdered whiting, precipitated calcium carbonate and chalks; Such as inorganic fillers such as the silicates that comprises kaolin, calcined clay, pyrophyllite, sericite and talcum and titanium dioxide, calcium sulfate, barium sulfate, zinc oxide, zinc sulphide, zinc carbonate, alumina silicate, calcium silicates, magnesium silicate, synthetic silica, aluminium hydroxide, aluminium oxide, hard charcoal, saponite, dolomite, calcium montmorillonite, sodium montmorillonite and bentonites; With such as organic fillers such as acrylic compounds plastic pigments, polyethylene, chitosan particle, cellulose grain, polyamino acid particle and styrene.Be maintenance and the whiteness of improving the image quality in the xerography, preferably mixed calcium carbonate in the process of producing acid-free paper.
In addition, various chemical substances such as for example sizing agent can be added in the paper base material that constitutes paper of the present invention in the mode that add inside or add the outside.
The example that can be added into the sizing agent in the paper base material comprises such as sizing agents such as rosin based sizing agent, synthetic sizing agent, tree oil lipid sizing agent and neutral sizing agents.Also can use as sizing agents such as aluminum sulfate and cationic starch and the combination of deciding agent.
Utilize the keeping quality of the paper after the imaging of xerography imaging device for improvement, the preferred neutral sizing agent that uses in the above-mentioned sizing agent is as alkenyl succinic anhydride class sizing agent, alkyl ketene dimer, thiazolinyl ketene dimer, neutral rosin, oil sizing agent, olefine kind resin and styrene-propene acid resin.The example of Cypres comprises such as cellulose modified products such as oxidation modification starch, enzymically modified starch, polyvinyl alcohol and carboxymethyl celluloses; Styrene-propene acids latex; Styrene maleic acid class latex; And acrylic latex, these sizing agents can be used singly or in combination.
In addition, paper power reinforcing agent can be added in the paper base material that constitutes paper of the present invention in the mode that add inside or add the outside.
The example of paper power reinforcing agent comprises starch, modified starch, natural plant gum, carboxymethyl cellulose, polyvinyl alcohol, modified polyvinylalcohol, polyacrylamide, styrene-maleic anhydride copolymer, vinyl chloride vinyl acetate copolymer, Styrene-Butadiene, polyacrylate, Lauxite, melamine formaldehyde resin, dialdehyde starch, polymine, epoxidation polyamide, polyamide-chloropropylene oxide resinoid, methylolation polyamide and chitosan derivatives, and these paper power reinforcing agents can use separately and also can be used as the mixture use.
, so that maintaining approximately below 0.15, average dehumidification speed S1a humectant can be added in the paper base material for reducing average dehumidification speed S1a.
In this case, with respect to the paper pulp fiber in the paper of being included in of 100 parts by mass, the content of described humectant is preferably more than 0 parts by mass, more preferably from about more than 10 parts by mass, and then more preferably from about more than 15 parts by mass.When not using humectant, average dehumidification speed S1a possibly can't maintain about below 0.15, thereby is difficult to suppress the decline that detects precision of paper.Although the upper limit of the content of humectant is not particularly limited, but in the practicality with respect to the paper pulp fiber in the paper of being included in of 100 parts by mass, the content of humectant is preferably below about 50 parts by mass, more preferably from about below 45 parts by mass, and then more preferably from about below 40 parts by mass.
Spendable examples of humectants comprises glycerine, alkanediol class, alkane three alcohols, plant extracts, honey, 1,1,1-three (hydroxymethyl) propane, such as carbohydrate and sugar alcohols such as monose and oligosaccharides.
The example of monose comprises D-fructose and L-fructose, Tagatose, sorbose, ribose, wood sugar, arabinose, lyxose, glucose, mannose, allose, altrose, gylose, idose, galactolipin, talose and gulose.
The example of oligosaccharides comprises maltose, lactose, sucrose, gossypose, gentianose, stachyose and xylan.
The example of sugar alcohol comprises tetritol, D-antierythrite and L-antierythrite, arabite, xylitol, adonite, ribitol, D-D-sorbite, allitol, D-sweet mellow wine, D-iditol, D-talitol, galactitol and heptitols.
About humectant, also can use the material except the above-mentioned material of enumerating with moisture-retaining capacity.Specifically, the preferred use rate of preserving moisture is about the material more than 1.5.
Herein, the rate of preserving moisture is represented by following formula (4):
Preserve moisture rate=of formula (4) (by material with 1g/m with moisture-retaining capacity 2The damping moisture of the paper of coating)/(the damping moisture of untreated paper).
(concentration with material of moisture-retaining capacity: 10 quality %) coating filter paper is so that its solid constituent that has is about 1g/m with the aqueous solution that comprises the material with moisture-retaining capacity 2, measure the damping moisture of thus obtained paper, and measure the damping moisture of untreated paper (filter paper) of the aqueous solution of the material that not have coating to have moisture-retaining capacity, then by formula (4) the calculating rate of preserving moisture.
Based on the environment of the JIS-P-8111:1998 of Japanese Industrial Standards (temperature: 23 ℃, relative humidity: 50%), after the paper that will be coated with the aqueous solution that comprises the material with moisture-retaining capacity and untreated paper damping are more than 24 hours, measure damping moisture.
Measure damping moisture based on the method for JIS-P-8127:1998 by the represented paper of formula (4).
, so that maintaining approximately more than 0.045, average rate of moisture absorption S2a hygroscopic agent can be added in the paper base material for increasing average rate of moisture absorption S2a.In this case, with respect to the paper pulp fiber in the paper of being included in of 100 parts by mass, the content of described hygroscopic agent is preferably more than 0 parts by mass, more preferably from about more than 10 parts by mass, and then more preferably from about more than 15 parts by mass.If do not use hygroscopic agent, then average rate of moisture absorption S2a possibly can't maintain about more than 0.045, thereby is difficult to suppress the decline that detects precision of paper.Although the upper limit of the content of hygroscopic agent is not particularly limited, but in the practicality with respect to the paper pulp fiber in the paper of being included in of 100 parts by mass, the content of hygroscopic agent is preferably below about 50 parts by mass, more preferably from about below 45 parts by mass, and then more preferably from about below 40 parts by mass.
The hygroscopic agent that uses is not particularly limited, as long as it is the material with high wettability power, the example comprises silica gel and Na 2SO 4
Except above-named various compositions, what contain in the common paper medium also can be used for paper base material in case of necessity such as various auxiliary agents such as dyestuff and pH regulator agent.
When making paper of the present invention, the paper method of copying of the material by constituting paper base material or the order by this material, or have the paper that required layer constitutes by superficial layer being set in case of necessity, can making on paper base material.
For example, will mix to make the paper stock slurry, make the paper base material layer thus such as the material of formation paper base materials such as above-mentioned paper pulp fiber.Then, the one side decentralized configuration magnetic material at this paper base material layer is combined in another paper base material laminating on the described surface that disposes magnetic material again, makes paper base material thus.In addition, as required, can on the surface of described paper base material, superficial layer be set.
By copying paper in constituting the material (as paper pulp fiber) of paper base material, comprising the paper stock slurry that magnetic material forms, can make the single-part stationery base material, can on the surface of paper base material, superficial layer be set in case of necessity.As selection, can will be combined on the two sides of the paper base material layer that comprises magnetic material the paper base material that has three-decker with manufacturing by using the paper stock slurry do not comprise magnetic material copy the paper base material laminating that paper makes.In addition, as required, can on the surface of described paper base material, superficial layer be set.Therefore, can utilize multilayer to copy paper and make paper base material, also can make described paper by further formation superficial layer.
Although paper of the present invention can constitute for the individual layer that only has one deck paper base material, preferably has two-layer or two-layer above layer.In this case, described paper base material itself can have two-layer or two-layer more than, can on the one or both sides of described paper base material, superficial layer be set, the formation that perhaps described paper base material also can obtain for both combinations.
If paper base material has two-layer or two-layer above layer, the magnetic material that can prevent at the interface that magnetic material is configured between layer and the layer is exposed on the surface of paper, and makes magnetic material can be included in the position of the inboard on paper surface.
Have in the situation of the layer more than three layers or three layers at paper base material, can be in the layer except that outermost layer of paper base material or interlayer dispose magnetic material, can make magnetic material be included in the inner side on paper surface thus.In this case, it is such formation that most preferred layer constitutes: described paper base material has the two-layer at least or two-layer above paper base material layer that contains paper pulp fiber at least, any two-layer adjacent paper base material layer each other lamination together, magnetic material is configured in the two layers of paper substrate layer at the interface.
Thereby be exposed on the surface of paper for preventing that magnetic material is outstanding, and magnetic material is configured in the inner side on paper surface, superficial layer also preferably is set.It is effective when paper base material has the individual layer formation superficial layer being set especially.
As mentioned above, in case of necessity, can obtain the required formation that the layer on the paper thickness direction constitutes by the manufacturing process of selection and combination paper.
So that average dehumidification speed S1a maintains approximately below 0.15, paper of the present invention preferably has the barrier layer in order to reduce average dehumidification speed S1a.
Herein, the barrier layer is meant to have and suppresses that the hydrone that exists in the paper moves towards the paper surface with respect to the thickness direction of paper or the layer of the function of diffusion.Specifically, the barrier layer is meant the layer (yet the content of barrier material in the barrier layer is about 30 quality %～100 quality %) that comprises at least a barrier material that is selected from resin and adhesive.
The hydrone that described barrier layer can have in the above-mentioned inhibition paper moves function and other functions of diffusion.Thereby most preferably described barrier layer only constitutes the hydrone of more effectively carrying out in the inhibition paper by barrier material moves the function of diffusion.Although the thickness on described barrier layer is not particularly limited, for effective mobile and diffusion that suppresses the hydrone in the paper, more than preferred about 1 μ m, more preferably from about more than the 2 μ m, simultaneously, although the higher limit of the thickness on barrier layer is not particularly limited, be preferably in the practicality below about 25 μ m.
Can comprise the layer of paper pulp fiber and magnetic material (when magnetic material be configured in two interlayers at the interface the time this layer expression these both sides, interface two-layer) configuration barrier layer, two sides.For example, when the barrier layer is configured in the two sides of the paper base material that comprises paper pulp fiber and magnetic material, described barrier layer can be set to directly contact with the paper base material surface, perhaps such as pigment coated the grade on other layers the barrier layer is set what be arranged to contact with the surface of paper base material.In this case, preferably, described barrier layer is the resin bed that mainly comprises resin.
When paper base material has the three-ply paper substrate layer, and when only in paper base material layer, comprising magnetic material, can and be disposed between the paper base material layer of one or both sides of this paper base material layer at the paper base material layer that is disposed at middle position the barrier layer is set with respect to the configuration of the middle position of paper thickness direction.In this case, for making the combination of two paper base material layers, described barrier layer is preferably the adhesive layer that mainly comprises adhesive.
Can use known thermoplastic resin or adhesive as the barrier material that constitutes the barrier layer.As described thermoplastic resin, can use those thermoplastic resins that are used for resin bed described later.As described adhesive, can use to be used for those pigment coated adhesives of aftermentioned.
The paper method of copying of making paper base material (or paper base material layer) is not particularly limited.Can adopt multilayer to copy in paper method and known fourdrinier paper machine, cylinder paper machine and the two net mode any.Can adopt acidity or anacidity to copy the paper method arbitrarily.
The available example that multilayer is copied the paper method comprises that the cylinder multi-cylinder copies that paper method, fourdrinier wire multi-cylinder are copied the paper method, paper method, box paper method and short net (direct wire) or the fourdrinier wire mode of copying of bull are copied in fourdrinier wire/cylinder combination.For example, can adopt " the up-to-date paper technology of copying---theoretical and actual " (" The Lastest PaperMaking Techniques-Theory and Practice "; The black three youths work of stone, system paper chemistry institute, 1984) in the method that discloses in detail any, the net multiple casing that can also adopt a plurality of nets to form a line.
Sizing agent can be added into the surface (when the paper base material of paper had a plurality of paper base material layer, this surface was the surface of the outermost paper substrate layer) of paper base material in case of necessity, to improve surface strength, as long as the absorption of waterborne liquid can not be suppressed.The example of sizing agent comprises rosin based sizing agent, synthetic sizing agent, tree oil lipid sizing agent and neutral sizing agent.In addition, can also will be used in combination such as aluminum sulfate and cationic starch etc. and the agent of deciding between sizing agent and paper pulp fiber.
In addition, preferably following size press liquid is coated on the surface (when the paper base material of paper had a plurality of paper base material layer, this surface was the surface of the outermost paper substrate layer) of paper base material.
The example that is used for the adhesive of size press liquid comprises such as raw starch such as cornstarch, farina and tapiocas; And such as modified starches such as enzymically modified starch, phosphorylated starch, cationic starch and acetylated starches.Other examples include but not limited to that also these adhesives can use separately or use as mixture such as water soluble polymer and derivatives thereof such as polyethylene glycol oxide, polyacrylamide, Sodium Polyacrylate, sodium alginate, Carboxymethyl Cellulose, carboxymethyl cellulose, methylcellulose, polyvinyl alcohol, guar gum, casein and curdlans.Yet, consider manufacturing cost, usually use starch, because it is cheap.
Paper of the present invention also comprises magnetic material.Therefore, when the insulating barrier that is not made of resin, metal oxide etc. on the surface of magnetic material was covered, the resistance of magnetic material periphery reduced easily.Given this, by the xerography imaging time, the toner image that forms on the surface to photosensitive-member or intermediate transfer element exists the periphery of the part of magnetic material that local transfer printing can take place when carrying out transfer printing bad, and the result causes the generation of image hickie.
Therefore, preferably regulate the surface resistivity of paper or specific insulation so that its within the limits prescribed, thereby prevent the generation of hickie.For adjusting resistance, the resistance adjustment agent can be used for paper of the present invention.The example of resistance adjustment agent comprises such as inorganic matters such as sodium chloride, potassium chloride, calcium chloride, sodium sulphate, zinc oxide, titanium dioxide, tin oxide, aluminium oxide and magnesia, and such as organic matters such as alkyl phosphate salt, alkyl sulfate salt, sulfonate sodium and quaternary ammonium salts, these materials can be used singly or in combination.The example that makes these resistance adjustment agent be included in the method in the paper is included in and mixes described inorganic matter or organic matter in the above-mentioned size press liquid, and this mixed liquor is coated on the lip-deep method of above-mentioned paper base material.
Size press liquid is coated on the paper base material surface (when the paper base material of paper has a plurality of paper base material layer, this surface is the surface of the outermost paper substrate layer) the example of method not only comprise size presser, also comprise coating machine commonly used, be coated with machine, Kohler coater, bar type knife type coater and knife type coater as seam size, braking club, roll coater, rod.
In addition, it is pigment coated to form to be coated with mainly the coating fluid that is made of adhesive and pigment on the one side at least of paper of the present invention, has pigment coated paper and can be used as coated paper.
In order to obtain the image of high gloss, can on this is pigment coated, resin bed be set.
The resin that is used for resin bed is not particularly limited, and can be any known thermoplastic resin.The example of resin comprises the resin with ester bond; Polyurethane resin; Polyamide is as urea resin; Polysulfone resin; Corvic, polyvinylidene chloride resin, vinyl chloride vinyl acetate copolymer resin, vinyl chloride-vinyl propionate ester copolymer resin; Polyol resin is as polyvinyl butyral resin; Celluosic resin is as ethyl cellulose resin and cellulose acetate resin; Polycaprolactone resin, phenylethylene-maleic anhydride resin, polyacrylonitrile resin, polyether resin, epoxy resin, phenolic resins; Vistanex is as acrylic resin and polyvinyl resin; The copolymer resin of alkene (as ethene and propylene) and another kind of vinyl monomer; And acrylic resin.
Water-soluble high-molecular compound and/or water dispersible macromolecular compound can be as pigment coated with the adhesive that is contained in the coating fluid.The example of described adhesive comprises such as starch such as cationic starch, amphoteric starch, oxidized starch, enzymically modified starch, heat chemistry modified starch, esterification starch and etherification starchs; Such as cellulose derivatives such as carboxymethyl cellulose and hydroxyethylcelluloses; Such as natural or semi-synthetic macromolecular compounds such as gelatin, casein, soybean protein and natural rubbers; Such as polydiene such as polyvinyl alcohol, polyisoprene, neoprene and polybutadiene; Such as polyolefin such as polybutene, polyisobutene, polypropylene and polyethylene; Vinyl class in polymer and copolymer such as vinyl halide, vinyl acetate, styrene, (methyl) acrylic acid, (methyl) acrylate, (methyl) acrylamide and methyl vinyl ether etc.; Such as styrene-butadiene and methyl methacrylate-butadiene type synthetic rubber latex; And such as synthetic macromolecular compounds such as polyurethane resin, mylar, polyamide, alkene-maleic anhydride resin and melmacs.According to the QT Quality Target of paper, can be from above-mentioned adhesive suitably select to use one or both or two or more.
Pigment coated example with the pigment that is contained in the coating fluid comprises mineral pigment, as powdered whiting, precipitated calcium carbonate, kaolin, calcined kaolin, constructivity kaolin, layering kaolin, talcum, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, aluminium oxide, magnesium carbonate, magnesia, silica, Magnesiumaluminumsilicate, microgranular calcium silicates, microgranular magnesium carbonate, microgranular precipitated calcium carbonate, hard charcoal, bentonite, zeolite, sericite and montmorillonite; Organic pigment, as polystyrene resin, styrene-propene acid copolymer resin, urea resin, melmac, acrylic resin, vinylidene resin, benzoguanamine resin, and the organic pigment of their small hollow particle and through hole type particle.These pigment can use separately, or use two or more pigment.
With respect to the pigment of 100 weight portions, adhesive is about 5 parts by mass～about 50 parts by mass with respect to above-mentioned pigment coated proportion optimization with the pigment in the coating fluid.When adhesive during less than about 5 parts by mass, following point takes place then with respect to the proportioning of the pigment of 100 parts by mass.At first, thus with pigment coated with coating fluid be coated on the paper base material on described paper base material, form pigment coated, but when further coating resin layer, the surface of paper base material is soaked by resin liquid, thereby can not obtain good blank sheet of paper glossiness.If adhesive surpasses about 50 parts by mass with respect to the proportioning of the pigment of 100 parts by mass, when coating pigment coating on paper base material is used coating fluid, produce bubble, thereby cause pigment coated rough surface, thereby can not obtain good blank sheet of paper glossiness.
Various auxiliary agents can be added into pigment coated in case of necessity with in the coating fluid.The example of described auxiliary agent comprises surfactant, pH regulator agent, viscosity modifier, softening agent, gloss imparting agent, dispersant, fluidity regulator, conduction inhibitor, stabilizing agent, antistatic additive, crosslinking agent, antioxidant, sizing agent, fluorescent whitening agent, colouring agent, ultra-violet absorber, defoamer, waterproofing agent, plasticizer, lubricant, preservative agent and aromatic.
The above-mentioned pigment coated amount of coating on the paper with coating fluid can suitably be selected according to the application target of paper of the present invention.Usually need be the lip-deep concavo-convex amount of covering paper fully.Therefore, the pigment coated amount of coating on the above-mentioned paper with coating fluid is preferably about 2g/m in dry mass 2～about 8g/m 2
As with the above-mentioned pigment coated lip-deep method of further coating the paper base material that has been coated with size press liquid with coating fluid, can select and use general known coating machine in case of necessity.The example of general known coating machine comprises that knife type coater, Kohler coater, roll coater, reverse roll coater, rod are coated with machine, curtain coater, slit die coating machine, intaglio plate formula coating machine, Champlex coating machine, brushing machine, two roller or metering scrape type size press coater, Bill knife type coater, short coating machine and the braking club formula coating machine of stopping.
Described pigment coated can being arranged on the paper base material is as the superficial layer of the one or both sides of described paper.Therefore, thus superficial layer can have one deck or two-layer in case of necessity or two-layer above intermediate layer provides multi-ply construction.Two sides at paper is provided with superficial layer, or superficial layer has in the situation of multi-ply construction, and the coating weight that is used to form the coating fluid of each coating needn't be identical.In addition, being used to form the kind of the material that contains in the coating fluid of each coating also needn't be identical with content.Coating fluid can be adjusted to satisfy above-mentioned prescribed limit according to required level of quality.
On the one side of paper, be provided with in the pigment coated situation, coating that synthetic resin layer can be set on the another side of paper, constitute by adhesive and pigment etc. or the charged layer etc. that prevents, paper is had for example prevent to curl and take place, improve the functions such as turnover paper applicability of impressionability and paper.
In addition, further carry out various processing,, can also give the characteristic that paper is suitable for various uses as post processings such as gluing processing, magnetic processing, flame treatment, heat-resisting processing, WATER REPELLENT TREATMENT, anti-oil processing and anti-skidding processing by above-mentioned another side to paper.
Paper of the present invention is preferably made by this way: in case of necessity, after above-mentioned sizing agent, size press liquid and pigment coated surface with coated paper base materials such as coating fluids, use the smoothing treating apparatus, carry out smoothing as supercalender, gloss calender and soft calender and handle.Smoothing can be as required to carry out at the machine or the mode of disembarking.The form of press, the number of pressor areas and heat etc. also can be according to suitably regulating according to standard smoothing treating apparatus.
The various physical propertys of-paper-
The basic weight of paper of the present invention (JIS P-8124) is preferably about 60g/m although be not particularly limited 2More than.If basic weight is less than about 60g/m 2, then the rigidity of paper reduces; Therefore, such problem can appear in the fixing device of toner image on paper being used for being transferred on the paper: because curling or peeling off bad and be easy to occur image deflects during imaging in the imaging device that uses xerography of paper taken place.Equally, if basic weight less than about 60g/m 2, the magnetic material that comprises in the paper is easy to be configured in the scope of paper surface less than about 5 μ m; When the result formed image when the imaging device that utilizes xerography or ink-jet method, the transfer printing blank appearred.
So that average rate of moisture absorption S2a maintains approximately more than 0.045, the density of paper is preferably 1.0g/cm in order to increase average rate of moisture absorption S2a 3Below, 0.9g/cm more preferably from about 3Below.If density is greater than about 1.0g/cm 3, then can not maintain average rate of moisture absorption S2a about more than 0.045.On the other hand, although the lower limit of the density of paper is not particularly limited, for suppressing any increase of paper thickness, the lower limit of the density of paper is preferably about 0.6g/cm 3More than.
On the other hand, so that average dehumidification speed S1a maintains approximately below 0.15, the Stockigt degree of sizing of paper is preferably bigger, specifically, is preferably about more than 40 seconds in order to reduce average dehumidification speed S1a.
Yet the Stockigt degree of sizing is about more than 40 seconds in the situation of the paper base material that individual layer constitutes if only have at paper, is difficult to toner is transferred to the surface of paper during imaging.
Therefore, when regulating the Stockigt degree of sizing, preferably paper base material has the layer formation that comprises the three-ply paper substrate layer, and only has the paper base material layer of the middle position that is configured in the paper thickness direction to comprise magnetic material.In this case, the Stockigt degree of sizing of paper base material layer that is configured in the middle position of paper thickness direction is set at about more than 40 seconds, is set at about below 35 seconds at the Stockigt degree of sizing of the paper base material layer of the two sides configuration of the paper base material layer of the middle position that is configured in the paper thickness direction.Utilize this formation, average dehumidification speed S1a can further reduce, and suppresses the bad generation of toner transfer printing.
According to above explanation, the Stockigt degree of sizing of paper base material layer that is configured in the middle position of paper thickness direction is preferably about more than 40 seconds, more preferably about more than 45 seconds, more preferably about more than 50 seconds.Although the higher limit of this Stockigt degree of sizing is not particularly limited, be preferably in the practicality about below 60 seconds.
On the other hand, the Stockigt degree of sizing of the paper base material layer that disposes on the two sides of the paper base material layer of the middle position that is configured in the paper thickness direction is preferably about below 35 seconds, more preferably about below 32 seconds, more preferably about below 30 seconds.Although the lower limit of this Stockigt degree of sizing is not particularly limited, be preferably in the practicality about more than 5 seconds.
The Stockigt degree of sizing of paper base material (or paper base material layer) can be regulated by the mixed inner adding type sizing agent of adjusting stage that for example used paper stock is starched when copying paper.
In the present invention, the Stockigt degree of sizing is meant the Stockigt degree of sizing of measuring under the specified standard environment in JIS P8111:1998 (23 ℃ of temperature, relative humidity 50%) based on JIS P8122:1976.
In addition, paper of the present invention in the environment of 23 ℃/50%RH damping more than 12 hours after, the moisture content of this paper is preferably about 4.0 quality %～about 7.0 quality %, 4.5 quality %～about 7.0 quality % more preferably from about, if moisture content is less than about 4.0 quality % or greater than about 7.0 quality %, image quality may deterioration when then utilizing the xerography imaging.
Paper of the present invention also can be used for by utilizing the imaging as other known writing-methods such as ink-jet methods except that xerography.
Described transfer paper as mentioned above, the invention provides a kind of transfer paper for electrophotography, even also can suppress the decline that detects precision of paper after just forming image by xerography.
Embodiment
Although will carry out more specific description to the present invention with reference to following examples, the present invention is not limited to this.In each embodiment and comparative example, use identical magnetic line.
(embodiment 1)
The paper stock slurry comprises 95 parts by mass LBKP (bleached hardwood kraft pulp) and 5 parts by mass NBKP (coniferous tree bleached kraft pulp), paper pulp solid constituent with respect to 100 parts by mass, in this slurry, add 0.15 parts by mass cationic starch (trade name: MS4600, make by japanese food chemical industry (strain)) and 0.1 parts by mass alkenyl succinic anhydride (trade name: Fiveran 81 is made by NipponNSC Ltd.).
Subsequently, be that 20 μ m, length are that the magnetic line (forms: Fe is) of 40mm is further starched with paper stock and mixed with 45 parts by mass as the glycerine of humectant (refined glycerine is made by Kao Corp) and 5 diameters.
Thus obtained paper stock slurry (solid component concentration is 1.0 quality %) utilizes orientation paper machine (Industrial Co., Ltd makes by Xiong Gu reason machine) to copy paper to make paper sheets under following condition.
＜copy paper slip spare 〉
The rotary speed of drum: 1,000 rev/min
The expulsion pressure of paper stock slurry: 1.0kgf/cm 2
Stroke number: 9 times
The sheet material that makes is gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then.As a result, obtaining basic weight is 65g/m 2Paper.The detailed characteristics of paper is presented in the table 1.
(embodiment 2)
With with embodiment 1 in identical mode papermaking, the quantitative change of the glycerine in the paper stock slurry that difference is to use is 5 weight portions.The basic weight of the paper that obtains is 68g/m 2The detailed characteristics of paper is presented in the table 1.
(embodiment 3)
With with embodiment 1 in identical mode make two pages of sheet materials that do not comprise magnetic material respectively, difference is, equally with embodiment 1 in the paper stock slurry for preparing of identical mode do not comprise humectant and magnetic material, and the stroke number of copying paper slip spare among the embodiment 1 is become 4 times.The basic weight of sheet material is 31g/m 2(below, this sheet material is called " sheet material A3 ") and 32g/m 2(below, this sheet material is called " sheet material C3 ").
Subsequently, with embodiment 1 in identical mode to have made basic weight be 31g/m 2Sheet material (below, this sheet material is called " sheet material B4 "), difference is, equally with embodiment 1 in the paper stock slurry for preparing of identical mode do not comprise humectant, and the stroke number of copying paper slip spare among the embodiment 1 is become 4 times.
Three pages of sheet materials that make are gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former respectively 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then.
Then, utilize knife type coater with mylar (trade name: MD-1985, by Toyobo Co., Ltd. makes) with every 3g/m 2Be coated on two surfaces of front and back of sheet material B3.After the coating, at once sheet material B3 is clipped between sheet material A3 and the sheet material C3, being that 100 ℃ and rotary speed are drying 2 times in 50cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature.Therefore, obtaining to have a layer basic weight that constitutes that comprises the three-ply paper substrate layer is 100g/m 2Paper, wherein said paper base material layer is by as the adhesive layer combination on barrier layer.The detailed characteristics of paper is presented in the table 1.
(embodiment 4)
The paper stock slurry comprises 95 parts by mass LBKP (bleached hardwood kraft pulp) and 5 parts by mass NBKP (coniferous tree bleached kraft pulp); With respect to 100 parts by mass paper pulp solid constituents, in this slurry, add 0.05 parts by mass cationic starch (trade name: MS4600, make by japanese food chemical industry (strain)) and 0.05 parts by mass alkenyl succinic anhydride (trade name: Fiveran 81 is made by NipponNSC Ltd.).
Subsequently, be that 20 μ m, length are the magnetic line (composition: Fe system) further mix with the paper stock slurry of 40mm with 5 diameters.
Thus obtained paper stock slurry (solid component concentration 1.0 quality %) utilizes orientation paper machine (society makes by the industry of Xiong Gu reason machine) to copy paper to make paper sheets under following condition.
＜copy paper slip spare 〉
The rotary speed of drum: 1,000 rev/min
The expulsion pressure of paper stock slurry: 1.0kgf/cm 2
Stroke number: 9 times
The sheet material that makes is gone up at 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Down squeezing 1 minute of pressure, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then.As a result, obtaining basic weight is 66g/m 2Paper.The detailed characteristics of paper is presented in the table 1.
(embodiment 5)
With with embodiment 1 in identical mode make two pages of sheet materials that do not comprise magnetic material respectively, difference is, equally with embodiment 1 in the paper stock slurry for preparing of identical mode do not comprise humectant and magnetic material, and the stroke number of copying paper slip spare among the embodiment 1 is become 4 times.The basic weight of sheet material is 35g/m 2(below, this sheet material is called " sheet material A4 ") and 34g/m 2(below, this sheet material is called " sheet material C4 ").
Subsequently, in comprising the paper stock slurry of 95 parts by mass LBKP (bleached hardwood kraft pulp) and 5 parts by mass NBKP (coniferous tree bleached kraft pulp), with respect to 100 parts by mass paper pulp solid constituents, add 0.15 parts by mass cationic starch (trade name: MS4600, make by japanese food chemical industry (strain)) and 0.6 parts by mass alkenyl succinic anhydride (trade name: Fiveran 81 is made by Nippon NSC Ltd.).With 5 diameters is that 20 μ m, length are the magnetic line (composition: Fe system) sneak into wherein of 40mm.
Thus obtained paper stock slurry (solid component concentration 1.0 quality %) utilizes orientation paper machine (society makes by the industry of Xiong Gu reason machine) to copy paper under following condition, thereby the manufacturing basic weight is 36g/m 2Sheet material (below, this sheet material is called " sheet material B4 ").
＜copy paper slip spare 〉
The rotary speed of drum: 1,000 rev/min
The expulsion pressure of paper stock slurry: 1.0kgf/cm 2
The spray angle of paper stock: 60 °
Stroke number: 4 times
Three pages of sheet materials making are become the mode lamination of central stratum (central core) so that sheet material B is configured between sheet material A and the sheet material C, they are gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then.Thus, can obtain to have a layer basic weight that constitutes that is formed by three-ply paper substrate layer lamination is 105g/m 2Paper.The detailed characteristics of paper is presented in the table 1.
(comparative example 1)
In comprising the paper stock slurry of 95 parts by mass LBKP (bleached hardwood kraft pulp) and 5 parts by mass NBKP (coniferous tree bleached kraft pulp), with respect to 100 parts by mass paper pulp solid constituents, add 0.15 parts by mass cationic starch (trade name: MS4600, make by japanese food chemical industry (strain)) and 0.2 parts by mass alkenyl succinic anhydride (trade name: Fiveran 81 is made by Nippon NSCLtd.).
Thus obtained paper stock slurry (solid component concentration is 1.0 quality %) utilizes orientation paper machine (society makes by the industry of Xiong Gu reason machine) to copy paper to make two pages of sheet materials under following condition.
＜copy paper slip spare 〉
The rotary speed of drum: 1,000 rev/min
The expulsion pressure of paper stock slurry: 1.0kgf/cm 2
Stroke number: 4 times
The sheet material that makes is gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then, (basic weight is 32g/m thereby obtain sheet material A ' 1 2) and sheet material C ' 1 (basic weight is 33g/m 2).
Use with embodiment 4 in identical paper stock starch and under following condition, make sheet material (sheet material B ' 1).
＜copy paper slip spare 〉
The rotary speed of drum: 1,000 rev/min
The expulsion pressure of paper stock slurry: 1.0kgf/cm 2
Stroke number: 4 times
The sheet material that makes is gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then, (basic weight is 34g/m thereby obtain sheet material B ' 1 2).
Three pages of sheet materials making are become the mode lamination of central stratum (central core) so that sheet material B ' 1 is configured between sheet material A ' 1 and the sheet material C ' 1, they are gone up with 10kgf/cm with squeezer (Industrial Co., Ltd makes by Xiong Gu reason machine) at the square handshcet former 2Pressure squeezing 1 minute, be that 100 ℃ and rotary speed are to carry out drying in 100cm/ minute the KRK spin-drier (Industrial Co., Ltd makes by Xiong Gu reason machine) in heating-up temperature then.Thus, can obtain to have a layer basic weight that constitutes that is formed by three-ply paper substrate layer lamination is 99g/m 2Paper.The detailed characteristics of paper is presented in the table 1.
-estimate-
For estimating the precision that detects of test paper existence, use the detecting gate shown in Fig. 3 (magnet-wire formula article monitoring system, trade name: SAS are made by Unipulse Corporation) to measure pulse signal from the magnetic material that is comprised in the paper.
The detecting gate that is used to estimate has a pair of (two) checkout gear, described checkout gear comprise the magnet exciting coil that is used to form alternating magnetic field and are used for the magnetic test coil of magnetization inversion of the magnetic line of test paper 100.Fig. 3 is the schematic diagram of formation that shows the detecting gate of the evaluation be used for embodiment.Fig. 3 A is the front view of described detecting gate.Fig. 3 B is the side view (the arrow directions X from Fig. 3 A is observed) that constitutes a detector of described detecting gate.Fig. 3 C is the vertical view (the arrow Y direction from Fig. 3 A is observed) that constitutes a detector of described detecting gate.In each figure, Reference numeral 100 expression paper (A4 size), 300 expression detecting gates, 302 expressions, first checkout gear, 304 expressions, second checkout gear, 400 expression baseplanes.Symbol H represents 400 height to paper 100 from the baseplane, and symbol E represents the distance of the side end of first detector 302 apart from the central point of the minor face of paper 100.
As shown in Figure 3, detecting gate 300 has first checkout gear 302 opposite each other on baseplane 400 and second checkout gear 304. Checkout gear 302 and 304 has identical formation, and it highly is about 1.5m.Distance between two checkout gears 302 and 304 is about 0.9m.
, under the environment of 23 ℃ and 23%RH, measure pulse signal herein, with paper 100 fixed placement and make it be parallel to the baseplane as shown in Figure 3, thereby make the contacts side surfaces towards checkout gear 304 these sides of the minor face and the checkout gear 302 of paper 100.400 height H to paper 100 are determined as 1 from the baseplane, 250mm, and the side end of detecting gate 302 is determined as 200mm apart from the central point of the minor face of paper 100 apart from E.During mensuration, in checkout gear 302 and face that paper 100 contacts, be H and be that the maximum intensity of alternating magnetic field of the position of E is set at 9.2Oe from the distance of the side end of checkout gear 302 apart from the baseplane height.
With the pulse signal input digit oscillograph (trade name: DL1540 is made by Yokogawa Electric Corporation) that utilizes detecting gate 300 to detect, pulse value is set at the voltage of the peak value of pulse.
To the paper that makes in each embodiment and the comparative example, the pulse value (pulse value after the photographic fixing) after measuring the pulse value (initial stage pulse value) of the preceding paper of photographic fixing and passing through the imaging device imaging.
Herein, the paper before the imaging test is carried out measuring the initial stage pulse value after the damping more than 12 hours under the environment of 23 ℃/50%RH.
The following mensuration of pulse value after the photographic fixing.Use before the imaging test at the paper of damping more than 12 hours under the environment of 23 ℃/50%RH, on the two sides of common paper, print the blank sheet of paper image by imaging device (DocuCentreColor f450 is made by Fuji Xerox Co., Ltd) with standard " A " pattern and panchromatic mode.Then, after carrying out two-face printing, described paper is moved to detecting gate 300 so that by state configuration shown in Fig. 3.
Herein, the pulse value after the photographic fixing is meant the pulse value of measuring after lighting 30 seconds from the time of the two-face printing operation back discharge from imaging device (photographic fixing has for the second time just finished the back) that just finishes paper.
The reason of measuring for the second time pulse value after the photographic fixing in 30 seconds is based on following typical case: the place, doorway in the room that disposes imaging device has disposed in the office of detecting gate, utilizes the people of imaging device output image to carry this paper at once and moves to outside this room.
Therefore, the variable quantity T (%) of pulse value can be calculated based on following formula (5) by the pulse value after initial stage pulse value and the photographic fixing.The result is presented in the table 1.
The variable quantity T=of formula (5) pulse value (pulse value after the photographic fixing/initial stage pulse value) * 100
Can think that along with reducing of the variable quantity T of pulse value, the precision that detects of paper is tended to reduce.
The criterion that is presented at the opinion rating in the table 1 is as follows.
G0:T is 80～100
G1:T is extremely less than 80 more than 50
G2:T is extremely less than 50 more than 30
G3:T is less than 30
Table 1
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Comparative example 1
Paper take off moisture-absorption characteristics Average dehumidification speed S1a (quality %/second) 0.09 0.14 0.12 0.24 0.12 0.17
Average rate of moisture absorption S2a (quality %/second) 0.03 0.03 0.02 0.07 0.05 0.03
|S2a/S1a| 0.33 0.21 0.17 0.29 0.42 0.18
The layer of paper base material constitutes The number of plies of paper base material layer 1 1 3 1 3 3
The existence on barrier layer Do not have Do not have Have Do not have Do not have Do not have
The Stockigt degree of sizing (second) of paper base material (or each paper base material layer) 25 26 - 13 28/55/25 38/14/37
Additive Humectant (parts by mass/100 parts by mass paper pulp fibers) 45 5 - - - -
Other physics values of paper Basic weight (g/m 2) 65 68 100 66 105 99
Density (g/cm 3) 0.83 0.88 0.94 0.81 0.93 0.92
The thickness of paper (μ m) 78 77 106 82 113 108
Moisture content after the damping (quality %) 6.6 5.8 4.6 5.5 6.4 6.4
Evaluation result The grade evaluation of pulse value variable quantity T G0 G2 G1 G1 G0 G3
It is for the purpose of illustration and description that aforementioned description to illustrative embodiments of the present invention is provided.Be not to attempt the disclosed precise forms of limit the present invention or the present invention is limited to disclosed precise forms.Obviously, many improvement and variation are conspicuous for those skilled in the art.Selecting and describing illustrative embodiments is in order to explain principle of the present invention and practical use thereof best, to make others skilled in the art can understand of the present invention various embodiments and the various improvement project of estimating to be applicable to special-purpose thus.Scope of the present invention is limit by following claim and equivalent thereof.

Claims (10)

1. transfer paper for electrophotography, described transfer paper for electrophotography comprises at least:
Paper pulp fiber and being used to produce big barkhausen magnetic material and
The paper base material that contains described paper pulp fiber and described magnetic material, wherein, described paper base material comprises three layers paper base material layer,
And the average dehumidification speed S1a of described transfer paper for electrophotography is below 0.15,
Wherein described transfer paper for electrophotography has been applied the processing that is used to improve moisture retention, described processing comprises humectant added in the paper,
Described average dehumidification speed S1a is meant the mean value of the dehumidification speed S1 of 5 paper, and unit is quality %/second, and described dehumidification speed S1 is meant the value by following formula (1) representative:
Formula (1) dehumidification speed S1=(W1a-W1b)/30
In formula (1), W1a represents in the environment of 23 ℃/50%RH the moisture content in the described paper after the paper damping is more than 12 hours, unit is quality %, the W1b representative will be placed 30 seconds to carry out the moisture content in the described paper after dehumidification is handled by the described paper of damping more than 12 hours in 80 ℃ environment in the environment of 23 ℃/50%RH, unit is quality %, constant in the formula shown in the denominator is represented the time that described dehumidification is handled to be needed, and this time is 30 seconds.
2. transfer paper for electrophotography, described transfer paper for electrophotography comprises at least:
Paper pulp fiber and being used to produce big barkhausen magnetic material and
The paper base material that contains described paper pulp fiber and described magnetic material, wherein, described paper base material comprises three layers paper base material layer,
And the average rate of moisture absorption S2a of described transfer paper for electrophotography is more than 0.045,
Wherein hygroscopic agent is added in the paper base material,
Described average rate of moisture absorption S2a is meant the mean value of the rate of moisture absorption S2 of 5 paper, and unit is quality %/second, and described rate of moisture absorption S2 represents the value by following formula (2) representative:
Formula (2) rate of moisture absorption S2=(W2b-W2a)/30
In formula (2), W2a represents in the environment of 10 ℃/15%RH the moisture content in the described paper after the paper damping is more than 12 hours, unit is quality %, the W2b representative will be placed 30 seconds to carry out the moisture content in the described paper after moisture absorption is handled by the described paper of damping more than 12 hours in the environment of 28 ℃/85%RH in the environment of 10 ℃/15%RH, unit is quality %, constant in the formula shown in the denominator is represented the time that described moisture absorption is handled to be needed, and this time is 30 seconds.
3. transfer paper for electrophotography, described transfer paper for electrophotography comprises at least:
Paper pulp fiber and being used to produce big barkhausen magnetic material and
The paper base material that contains described paper pulp fiber and described magnetic material, wherein, described paper base material comprises three layers paper base material layer,
And the average dehumidification speed S1a of described transfer paper for electrophotography is below 0.15 or the average rate of moisture absorption S2a of described transfer paper for electrophotography is more than 0.045,
Wherein hygroscopic agent is added in the paper base material, perhaps described transfer paper for electrophotography has been applied the processing that is used to improve moisture retention, described processing comprises humectant added in the paper,
Described average dehumidification speed S1a is meant the mean value of the dehumidification speed S1 of 5 paper, and unit is quality %/second, and described dehumidification speed S1 is meant the value by following formula (1) representative:
Formula (1) dehumidification speed S1=(W1a-W1b)/30
In formula (1), W1a represents in the environment of 23 ℃/50%RH the moisture content in the described paper after the paper damping is more than 12 hours, unit is quality %, the W1b representative will be placed 30 seconds to carry out the moisture content in the described paper after dehumidification is handled by the described paper of damping more than 12 hours in 80 ℃ environment in the environment of 23 ℃/50%RH, unit is quality %, constant in the formula shown in the denominator is represented the time that described dehumidification is handled to be needed, and this time is 30 seconds
Described average rate of moisture absorption S2a is meant the mean value of the rate of moisture absorption S2 of 5 paper, and unit is quality %/second, and described rate of moisture absorption S2 represents the value by following formula (2) representative:
Formula (2) rate of moisture absorption S2=(W2b-W2a)/30
In formula (2), W2a represents in the environment of 10 ℃/15%RH the moisture content in the described paper after the paper damping is more than 12 hours, unit is quality %, the W2b representative will be placed 30 seconds to carry out the moisture content in the described paper after moisture absorption is handled by the described paper of damping more than 12 hours in the environment of 28 ℃/85%RH in the environment of 10 ℃/15%RH, unit is quality %, constant in the formula shown in the denominator is represented the time that described moisture absorption is handled to be needed, and this time is 30 seconds
Wherein, the suction dehumidification speed by formula (3) definition of described transfer paper for electrophotography is more than 0.3 than R:
Formula (3) is inhaled dehumidification speed than the average dehumidification speed of the average rate of moisture absorption S2a/ of R=| S1a|.
4. as each described transfer paper for electrophotography in the claim 1～3, wherein, described magnetic material is that length is that 10mm～430mm and diameter are the silk thread shape magnetic material of 10 μ m～90 μ m.
5. as claim 1 or 3 described transfer paper for electrophotography, described transfer paper for electrophotography has been applied the processing that the moisture on the thickness direction that is used to suppress paper moves, wherein, described processing comprises provides the barrier layer with the function that suppresses the moisture diffusion on the paper thickness direction, or described processing comprises the Stockigt degree of sizing of the layer that contains magnetic material at least that increases paper.
6. as claim 1 or 3 described transfer paper for electrophotography, described transfer paper for electrophotography comprises the layer that comprises described paper pulp fiber and described magnetic material at least, with the barrier layer of containing barrier material, wherein, dispose described barrier layer on the described two sides that comprises the layer of paper pulp fiber and magnetic material at least.
7. as each described transfer paper for electrophotography in the claim 1～3, wherein, the moisture content in the environment of 23 ℃/50%RH in the described paper of damping after more than 12 hours is 4.0 quality %～7.0 quality %.
8. as claim 1 or 3 described transfer paper for electrophotography, described transfer paper for electrophotography comprises humectant, and wherein, with respect to the described paper pulp fiber of 100 parts by mass, the content of described humectant is greater than 0 parts by mass to 50 parts by mass.
9. as each described transfer paper for electrophotography in the claim 1～3, wherein, be arranged in the paper base material layer of central authorities of thickness direction of paper and comprise described magnetic material.
10. transfer paper for electrophotography as claimed in claim 9, wherein, the Stockigt degree of sizing of paper base material layer of central authorities that is arranged in the thickness direction of paper is more than 40 seconds, is below 35 seconds at the Stockigt degree of sizing of the paper base material layer of the two sides configuration of the paper base material layer of the central authorities of the described thickness direction that is arranged in paper.
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